All living things are made up of cells. The cell is the basic structural and functional unit of life. They were discovered by Robert Hooke in the year 1665. Cells consist of cytoplasm, organelles and nucleus enclosed within a plasma membrane. The membrane contains biomolecules such as proteins and lipids.

Match the following: Column A Column B (a)Unicellular (i)Green Plants (b)Multicellular (ii) Amoeba (c)Phototropism (iii)Plants and Animals (d)Autotrophs (iv)Animals (e)Heterotrophs (v)Growth towards light

(a)- (ii) Unicellular organisms are made up of only one cell that carries out all the functions needed by the organism. Unicellular organisms include bacteria, protists like Amoeba , and yeast. (b) - (iii) Multicellular organisms are composed of more than one cell, with groups of cells differentiating to take on specialised functions. Animals (Example: earthworm) and plants (Example: Mango) are multicellular organisms. (c) - (v) The movement of plant parts in response to light is called phototropism. The roots of the plant grow away from light while stem grows towards the light. Roots are negatively phototropic and stem is positively phototropic. (d) - (i) Green plants produce their own food by a process called photosynthesis. Therefore, plants are called autotrophs. (e) - (iv) Animals do not contain chlorophyll (a green coloured pigment), therefore cannot prepare their food. All animals depend on plants and other animals for their food. Therefore, they are called heterotroph. Column A Column B (a) Unicellular (ii) Amoeba (b) Multicellular (iii) Plants and animals (c) Phototropism (v) Growth towards light (d) Autotrophs (i) Green plants (e) Heterotroph (iv) Animals

Cell is the structural and functional unit of life. It is discovered by the scientist called Robert Hooke in 1665. The components of cell are cell membrane, nucleus, and cytoplasm. It contains a jelly-like structure which contains many organelles such as, mitochondria, chloroplast, nucleus, Golgi complex, ribosomes etc.

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Why is a cell called the basic structural unit of life?

Important Questions on Cell Structure and Micro-organisms

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Science>Biology>Cell Structure and Micro-organisms>Cell and its Features

Why diffusion process is not suitable for transportation in multicellular organisms ?

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Science>Biology>Cell Structure and Micro-organisms>Cell and its Features

Identify the elements which lead to much variation in the physical and chemical conditions of different habitats.
a) Only components such as Temperature, water, light and soil.
b) Only components such as pathogens, parasites, predators and competitors of the organism with which they interact constantly.
c) The physiology and anatomy of organisms
d) Both a and b

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Science>Biology>Cell Structure and Micro-organisms>Cell and its Features

What is a cell?

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Science>Biology>Cell Structure and Micro-organisms>Cell and its Features

The shell of an egg is removed by dissolving it in :

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Science>Biology>Cell Structure and Micro-organisms>Cell and its Features

What are the basic parts of all the cells?

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Science>Biology>Cell Structure and Micro-organisms>Cell and its Features

The basic unit of living things is called :

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Science>Biology>Cell Structure and Micro-organisms>Cell and its Features

What is the basic similarity among all the living organisms (plants and animals)?

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Science>Biology>Cell Structure and Micro-organisms>Cell and its Features

Can the various parts of a flower be observed by a microscope/hand lens/ electronic microscope? Give reason.

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Science>Biology>Cell Structure and Micro-organisms>Cell and its Features

What is the basic structural and functional unit of life?

MEDIUM

Science>Biology>Cell Structure and Micro-organisms>Cell and its Features

Match the following:

Column A	Column B
(a)Unicellular	(i)Green Plants
(b)Multicellular	(ii)Amoeba
(c)Phototropism	(iii)Plants and Animals
(d)Autotrophs	(iv)Animals
(e)Heterotrophs	(v)Growth towards light